Date (happened)
c. 1945
(possible)
passage 546222 (lecture nid 1836), 'The new theory today goes back to what they had twenty years ago -- it's all a bang'
Told / reported
8 June 1965
(probable)
delivery claims on lecture nid 1836: d0 catalog #789 (year 1965 only, certain, preferred) and d1 transcriber chrome dateline '6/8/65' (1965-06-08, probable, adding month/day to the certain year)